According to the information of official website, the ancient city of Changzhou in Dazu is free of charge, and tourists can visit it for free. Changzhou ancient city is an ancient city site with a long history and cultural heritage, and it is an important cultural heritage. For the convenience of tourists, the scenic spot provides free tour guide service and explanation service, through which tourists can better understand the history and culture of Changzhou ancient city. At the same time, tourists should also pay attention to protecting the environment and cultural relics of the scenic spot when visiting, and don't destroy and litter at will.